Mrs. Linda Worth requested for an assistance on the development of an agricultural waste system. Part of the request is

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Mrs. Linda Worth requested for an assistance on the development
of an agricultural waste system. Part of the request is to design
an anaerobic lagoon to handle the waste from her 500 cow dairy
operation with a recommended minimum volume for dairy waste of 9.21
cubic meter per 1000kg of animal. the average cow weighs 590kg with
a waste of 0.028 cu.m/day/cow. in order to successfully accomplish
the work, determine the total volume of lagoon considering 180 days
retention or storage days, a water dilution of 1:2 (water:waste),
0.2m rainfall depth at 25-year, 24 hr storm and a freeboard of 1
foot.